I forgot to mention that our aircrafts are old 1984 classics WITHOUT GPS - we are only RNAV 1 compliment !
According to my calculations if you are very heavy and it's a hot day it will take you about 10 NM to climb to 1500' AAL. According to my calculations ( using TANgent ) you need to ensure that you track with an accuracy of 1.8 degrees to ensure you do not exceeed the 600meters wide protected area for the 10 NM climb to 1500' ! Am I correct ?